Signaling system



No. 16 1926. l 1,607,466.

M. LATOUR SIGNALING SYSTEM Filed August 19 1921 /0 ll/'gh Frequenz] Transfbrmelzf Low Frggaelujy Transformer vwentoz/ MARlus LATOUR W @my um" tus wherein, as in the preceding applica-4 Patented Nov. 16, 1926. I

UNITED ,STATES P.1\T1:1 \Vrv OFFICE.

MARIUS LATOUR, OF PABIS, FRANCE, ASSIGNOR TO LATOUR CORPORATION, 0F JER- SEY CITY, NEW JERSEY, A CORPORATION 0F DELAWARE. I

SIGNLING SYSTEM.

Application filed August I9, 1921, Scria1 No. 493,670, and in France November 17, 1917.

(GRANTED UNDER THE PnovIsIoNs or THE AcT or manen a, 1921, 41 STAT'. L., 1313.)

A This invention comprises an improvement in or modification of the invention claimed in my prior Patent No.'1,584,70 1, granted May 11, 1926, in which is described in an amplifier with vthermionic tubes or audions .wherein amplification is conducted in stages the use of a common source for supplying with current the plate-filament circuits of the audions of the various stages.

- In my mentioned patent an amplifying system was described 1n which the same audions serve for an amplification of the highfrequency currents and of the low-,frequency currents.

The present invention provides apparation referred to, the same audions serve for amplification of the high. frequency currents and of the low frequency currents and in which twohigh frequency transformers are provided for enabling two supplementary stages of amplification tobe effected at high frequency and two low frequency transformers enable two stages of amplification at low frequency to be effected.

In the accompanying drawing illustrating this invention The thermionic tubes or audions 1, 2, 3, 4 have their filaments heated by the battery 5 and their plates supplied with current by the battery 6. The high-frequency current to be amplified, viz, the wireless telegraphy or telephony reception, is led to the terminals 7 and 8 a capacity 9 being interposed on the filament side.'v This capacity 9 enables thev positive pole ofthe battery 6 to be earthe'd at 28 without inconvenience even when no telephone transformer is used. The highfrequency transformers 10, 11 enable two supplementary stages of amplification to heV carried out at high frequency and the high'f frequency transformer 12 serves to supply'- current to the detector lamp 4 through the shunted capacity 22.` The low-frequency transformers 13 and 14 enable two stages of amplification at low frequency to vbe carried out with the lamps 2 and 3. Listening takes place between the terminals 15 and 16, either directly or with the interposition of a telephonie transformer. The capwc ities 17, 18, 19, 20 and" 21 suitably located, let the high frequency currents pass.

InA frequency electrical practice there may be established on the transformers 13 and 14 windings such that the capacities 17, 18, 19 and 20 (more particularly the capacities 17 and 20) may be omitted. A connection has moreover been shown in the drawing between the plates of the audions 3 and 4. This connection is established through the capacity 23. Its object is to increase the amplification if possible. Quite generally, it should be conceived that for the purpose of obtaining this result the connection between the plates of the audions 3 and 4 may be made with a self-inductance 27 in series with a capacity.

Having described my invention, claim is:

'1. In apparatus for amplifying high frequency electrical oscillations having a low frequency component, a plurality of three element tubes connected in cascade, a detector associated with the output of the last tube of' the cascade, means for` applying the detected currents to the input circuit of one of said tubes other than the what I` last of the cascade, and a low frequency transformer in a circuit intermediate the input of said other tube and the output cirv cuit of said last tube ,of the cascade.

2. vIn apparatus for amplifying high frequency electrical oscillations having a low frequency component, la plurality of three element tubes connected in cascade, a detector associated with the output of the last tube ofthe cascade and a low frequency than the last tube of the cascade, a low. frequency '100 transformer in the output circuit of said" other tube, and indicating means in the output circuit of a tube succeeding said other tube. a v 4.v Inapparatus for amplifying high A oscillations having a low frequency component, a plurality of three element tubes connected in cascade, a detector associated with the output of the .last tube of the cascade, means for applying the detected currentsnto the input of one of said tubes other than the last tube of the cascade, a low frequency transformer in the output circuit of said other tube and indicating means in the output circuit of the tube preceding the detector.

5. In apparatus for amplifying high frequency electrical oscillations having a low frequency component, a plurality of three element tubes connected in cascade, a detector associated with the output of the last tube of the cascade, means for applying the detected currents to the input circuit of one of said tubes other than the last tube of the cascade, means includingv a low frequency transformer for interlinking the input of said other tube and the output circuit of the last tube ofV the cascade, and indicating means in the output circuit of one of said tubes.

6. In apparatus for amplifying high frequency electrical oscillations having a low frequency component, a plurality of three element tubes connected in cascade, a detector associated with the output of the last tube of the cascade, means for applying the detected currents to the input circuit of one of said tubes other than the last tube of the cascade, means including a low frequency transformer for interlinking the input of said other tube and the output of the last tube of the cascade, and indicating means in the output circuit of the last tube of the cascade.

7. In apparatus for amplifying high frequency electrical oscillations having a low frequency component, a plurality of three element tubes connected in cascade, a detecthe input of said other tube and the outputA 0f the last tube of the cascade.

8. In apparatus for amplifying high frequency electrical oscillations having a low frequency component, a plurality 4of three element :tubes connected in cascade, a detector associated withthe output of the last -tube of the cascade, means for applying Vthe detected currents .to the input circuit of one of said tubes other than the last tube of the cascade, means including a low frequency transformer for interlinking the input circuit of said other tube and the outputcircuit of the last tube and capacity associated with said low frequency transformer for by-passing the high frequency currents. 9. In apparatus for amplifying frequency electrical oscillations having a low 3 frequency component, a plurality of three element tubes connected in-cascade, adetector associated with the output circuit -of the last tube of the cascade, means' for ing tube, one of said transformers being for low frequency and the other for high frequency currents.

l0. In high frequency signalling systems, the combination of a plurality of thermionic amplifying elements, each having its output circuit coupled through a high frequency transformer to the input circuit of another of said elements, and at least one of saidv elements having its output circuit coupled through an additional and lower frequency transformer to the input circuit of another of said element-s, and means for shunting high frequency currents around Asaid lower frequency transformer.

l1. In high frequency signalling systems, the combination of a plurality of thermionic amplifying elements, each having its output circuit coupled through a high frequency transformer to the input circuit of lanother of said elements and at least one of said elements having its output circuit coupled through an additional and lower frequency transformer to the input circuit of another of said elements, and indicating apparatus associated with the output circuit of the last element having such additional lower frequency coupling in the input circuit thereof.

l2. In" high frequency signalling apparatus, the combination of a plurality of thermionic amplifying elements coupled in cascade, a detector coupled to the last of said elements, and means for coupling the output circuit of said detector to the input circuit of one of said elements, the coupling between said elements except the first two comprising a relatively high frequency transformer and a lower frequency transformer, and the coupling between the last said element and the detectorv comprising a high frequency transformer only.

13. In a radio receiver, the combination of a plurality of thermionic amplifying elements in cascade, each provided with an inputl circuit and an output circuit, means for doubly coupling the output circuit of one thermionic amplifying element top-the input circuit of another thermionic amplifying element, said coupling means including high frequency and low frequency devices, a detector linked to the last thermionic amplifying element of the cascade, and means for coupling said detector to saidrst'men- I A tioned thermionic amplifying element. 

